While product fresh water PDAM Surabaya Surya Sembada has to control not only the quality of chemical and biological quality but also to be
analyzed statistically. There are 3 kinds of characteristics into consideration in Surabaya PDAM water production which is TSS in the scale g l Chlor waste ppm scale and Turbidity NTU scale. To find out how much process capability of water production in PDAM Surya Sembada Surabaya it needs calculation to be
done in the multivariate. However before calculating process capability it needs to be made in advance Multivariate Hotelling T2 control chart to determine whether the process is under control or not. It also needs to look for things that may cause the process out of control. This can be done by making the Ishikawa diagram. The purpose of making Ishikawa diagram is that in case of observations that are beyond the control it can be eliminated. After the observation it is known that all the test results meet the standards desired specifications. However after statistically tested turns out there are some processes that out of control. Once the
processes are beyond the control eliminated by assuming a known cause then obtained a multivariate process capability index of water treatment at the IPAL Ngagel 2 PDAM Surabaya Surya Sembada 2.15. MCP price greater than one
indicates that

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